<template>
  <div>
<ul>
  <li v-for="item in arr" :key="item">{{item}}</li>
</ul>
<button @click="btn">走一走</button>
  </div>
</template>
<script>
  export default {
    data(){
      return{
        arr:["帅哥","美女","程序员"]
      }
    },
    methods:{
      btn(){
        this.arr.push(this.arr[0])
        this.arr.shift()
      }

    }
  
  }
</script>
<style>

</style>